Implemented a bit more of upb_context.

upb_context.c

@@ -5,6 +5,7 @@
  */
 
 #include <assert.h>
+#include <stdlib.h>
 #include <string.h>
 #include "descriptor.h"
 #include "upb_context.h"
@@ -72,6 +73,19 @@ bool upb_context_addfd(struct upb_context *c,
                        google_protobuf_FileDescriptorProto *fd,
                        int onredef)
 {
-  /* TODO */
+  /* TODO: properly handle redefinitions and unresolvable symbols. */
+  if(fd->set_flags.has.message_type) {
+    for(unsigned int i = 0; i < fd->message_type->len; i++) {
+      struct google_protobuf_DescriptorProto *d = fd->message_type->elements[i];
+      if(!d->set_flags.has.name) return false;
+      struct upb_symtab_entry e;
+      e.e.key = *d->name;
+      e.type = UPB_SYM_MESSAGE;
+      e.p.msg = malloc(sizeof(*e.p.msg));
+      upb_msg_init(e.p.msg, d);
+      upb_strtable_insert(&c->symtab, &e.e);
+    }
+  }
+  /* TODO: handle enums, extensions, and services. */
   return true;
 }

upb_context.h

@@ -69,6 +69,8 @@ struct upb_symtab_entry *upb_context_resolve(struct upb_context *c,
 struct upb_symtab_entry *upb_context_lookup(struct upb_context *c,
                                             struct upb_string *symbol);
 
+/* TODO: let the client enumerate the symbols. */
+
 /* Adding symbols. ************************************************************/
 
 /* Enum controlling what happens if a symbol is redefined. */

upb_msg.h

@@ -67,9 +67,11 @@ struct upb_msg {
   int num_required_fields;  /* Required fields have the lowest set bytemasks. */
   struct upb_inttable fields_by_num;
   struct upb_strtable fields_by_name;
-  struct upb_msg_field fields[];
+  struct upb_msg_field *fields;
 };
 
+/* Initialize and free a upb_msg.  Note that init does not resolve
+ * upb_msg_field.ref -- that is left to the caller. */
 void upb_msg_init(struct upb_msg *m, struct google_protobuf_DescriptorProto *d);
 void upb_msg_free(struct upb_msg *m);
 

upb_parse.h

@@ -37,7 +37,11 @@ void upb_parse_state_free(struct upb_parse_state *state);
  *
  * The client can set user_field_desc to a record describing this field -- this
  * pointer will be supplied to the value callback (for simple values) or the
- * submsg_start callback (for submessages).  */
+ * submsg_start callback (for submessages).
+ *
+ * TODO: there needs to be a way to skip a delimited field while still knowing
+ * its offset and length.  That could be through this callback or it could be a
+ * separate callback. */
 typedef upb_field_type_t (*upb_tag_cb)(struct upb_parse_state *s,
                                        struct upb_tag *tag,
                                        void **user_field_desc);

upb_table.h

@@ -94,7 +94,7 @@ INLINE void *upb_inttable_lookup(struct upb_inttable *t,
   uint32_t bucket = upb_inttable_bucket(t, key);
   struct upb_inttable_entry *e;
   do {
-    e = UPB_INDEX(t->t.entries, bucket-1, entry_size);
+    e = (struct upb_inttable_entry*)UPB_INDEX(t->t.entries, bucket-1, entry_size);
     if(e->key == key) return e;
   } while((bucket = e->next) != UPB_END_OF_CHAIN);
   return NULL;  /* Not found. */